I have Ubuntu 12.04 on a multi-homed host. I am trying to use iptables to reroute HTTP packets coming in to a certain IP address to another IP address.
From Googling, I believe it is necessary on multi-homed hosts to use CONNMARK to mark incoming connections, so that the related outgoing packets can be matched.
However, when I try to use the phrase '-j CONNMARK' I am told there is no such chain.
How can I use '-j CONNMARK' on Ubuntu 12.04?